He married Amphritrite
Rhode
no amphitrite is not Rhodes mom aphrodte is.
He married amphritrite goddess of the sea.
ummm nothing ha ha
Poseidon had two homes. On Mount Olympus and under the sea. But, he preferred to stay in his palace under the sea with his wife Amphritrite most of the time.
Poseidon had many wives and lovers. One of his wives was Amphitite, a mermaid. They bore three children- Rhodes, Benthesicyme, and Triton.
Percy Jackson is a demigod, meaning he is the son of one of the Greek gods, his being Poseidon. His mother, Sally Jackson, is a mortal, and has only ever had one son--Percy, so, from his mother's side, he has no siblings. But his father has had many, many sons over the years that are his half-siblings, such as one in particular: a Cyclops named Tyson who is Percy's half-brother. He has various others, but only a few are mentioned / seen throughout the series.